Tallness and length of 2012 GMC Sierra 1500 Work Truck 4×2 Extended Cab 8 ft. box 157.5 in. WB are 73.6″ and 249.2″ respectively since its width and wheel base are 80.0″ and 157.5″. 9.0″ is the ground clearance of this car which has curb weight as 5,259 lbs.